<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>三栏布局</title>
    <style>
        *{margin:0;padding: 0}
        .content{
            border:5px solid green;
            overflow: hidden;
        }
        .one{
            float: left;
            width:200px;
            height:200px;
            border:4px solid red;
            margin-right: 10px;
        }
    </style>
</head>
<body>
<div class="content">
    <div class="one">1</div>
    <div class="one two">2</div>
</div>
</body>
</html>
